triangle_shade
Arguments:
- x0,y0,x1,y1,x2,y2,R0,G0,B0,...,R1,G1,B1,...,R2,G2,B2,...
Description:
Draw triangle with interpolated colors on selected images.
Example of use:
$ gmic
image.jpg triangle_shade 20,20,400,100,120,200,255,0,0,0,255,0,0,0,255

Command:
image.jpg triangle_shade 20,20,400,100,120,200,255,0,0,0,255,0,0,0,255